P: Moving items in timeline sluggish in 25.4, behavior is new and repeatable

[BrianLevin]

I have been holding back for a while sticking with a very stable 25.2. I've logged a handful of bugs and issues since updating to 25.4, but this one is probably the big one because I needed more hands on time to really identify if it was just circumstantial or a real problem.

Plain and simple, something is wrong with the timeline in 25.4. To be more clear, when you select lots of items in the timeline and try to move them, the movement is sluggish. This was not the case in 25.2 and I suspect it has something to do with the way that the new 25.4 timeline tries to keep everything moving smoothly when trimming (which is nice by the way).

At first I was testing this on a sequence that had a ton of single word captions, which would have been a bit sluggish to select all track forward and move even in 25.2. It was worse in 25.4, noticeably so, but I didn't think too much of it.

I've since moved onto a project with far fewer cuts and segments on my timeline and no captions, and I'm still seeing the same behavior when selecting all clips forward. To test this, I tried selecting everything in my timeline from the front, and in the attached video you can clearly see the timeline objects moving choppy behind my mouse and then having a delay when landing, compared to what it should be like when I try the same operation at the back of my timeline.

There's also a reddit thread I posted on the other day where another user was asking about this and several commenters jumped in with their shared experience on 25.4, so I know this is something new to 25.4.

To be fair, I know if I have a massive timeline with tons of single caption segments it might not be reasonable to expect selecting and moving everything at once to be smooth, but I'm working on a single video track multicam podcast right now with four tracks of audio, there's no reason I should be seeing the kind of slow down that I'm currently experiencing.

Occurs on both of my workstations, both OSX 13.7.8:

Macbook Pro M1 Max

64gb RAM

Mac Studio M1 Ultra

128gb RAM

[video]

Video link:

https://www.dropbox.com/scl/fi/2vzmycslin027k8jmpbse/250907_sluggish-timeline.mov?rlkey=8dz9ntk2s9y2...

[Adolfo H.]

Hello! thank you for reporting this as well. We just added a fix to Premiere Pro Beta build 81. We are adding more improvements, so let me know if you run into any issues.

[Adolfo H.]

@stasym this is Adolfo from Adobe. We just added a fix starting on Beta build 81 for Premiere Pro. Let me know how it works for you. We are working on more improvements and I'll keep this thread up to date.

[JulianGustavoGomez-NP]

Thank you, Adolfo! Someone on my team just tried Build 81 and moving lots of clips is no longer lagging, but dragging to select the clips is causing lag and the spinning wheel on the Mac.

[Adolfo H.]

@JulianGustavoGomez-NP this is good to know! the team is looking into the marquee selection right now. I'll post when this work is done. Thank you!!!

[Adolfo H.]

@Haidar Karim this is Adolfo from Adobe. thank you for reporting this. We just added a fix in Beta starting with Build 81 that addresses this issue. We will keep adding performance updates till next release. If you get a chance to try it let us know how it works for you. Thanks!

[Adolfo H.]

@JulianGustavoGomez-NP hope you are doing well! If you download Premiere Pro Beta Build 87 or later, the marquee selection lag is now fixed. Thank you for pointing this out.

[vegasstocktankpools]

Adolfo, thanks for the updates and continued replies here. I updated to the latest Beta Build and it is indeed much better - what a relief! Thank you! I do still notice a bit of a lag when releasing the group of clips in the timeline that I'm dragging, but at this point I can't remember if this was happening before the big bug started. (Apple M3 Pro MacBook Pro, 36 GB ram, running Tahoe)

[Tom_edit]

Experiencing the same on windows, releasing (and undoing a move) is still pretty slow. Great to see this improving though, this has been a huge pain point over the years as it's gotten worse, then better, then worse again every other version

[JulianGustavoGomez-NP]

For some reason, untoggling the setting "Displays have seperate Spaces" on my Mac has basically gotten rid of this lag issue in Premiere for me. 

[Adolfo H.]

no worries. We have measured the performance and it should be the same, so please let me know if there is anything that is not working well. thnak you for testing it out!

[Adolfo H.]

oh interesting! do you have video of this? i wasn't able to repro it. Also which machine do you have?

[Cinemon]

Hi, Im on 25.5 and also got the lagging problem when moving all my clips at once. Coming from 24 I never had this problem 

[Adolfo H.]

Hi @Cinemon the fix is already in Beta and it will be in the next release. Thank you for your feedback.

[ds_aliengirl]

I tried a tried a recent 25.6 beta release which helped with the general lag but introduced more bugs than it solved. Tons of errors when just trying to play simple audio files.

[Adolfo H.]

Hi! Yes these errors are in beta as we are measuring and debugging that specific error. We have a fix that we will roll out really soon. Can I ask what are your system specs?

[ds_aliengirl]

Mac Pro 2019

Sequoia 15.7.1

3.2 GHz 16-core Intel Xeon

@Adolfo H. 

AMD Radeon Pro Vega II 32GB

224 GB RAM

Media drive - NVME RAID (Sonnet M.2 4x4 Silent PCIe 3.0 x16)

[MJedit]

Has this worked for anyone else? It didn't work for me.

[MJedit]

The only workaround I can find is to select all to the right and rather than dragging with mouse I move with Keyboard shortcut Nudge by 5 frames, and do that multiple times.

[fashionable_speaker5C50]

I see this bug has been addressed in the beta, considering it's quite substantial will it be retroactively fixed for 2025 or are we waiting until the 2026 version for it to be fixed? Thanks.

[Adolfo H.]

@fashionable_speaker5C50 this fix will be part of the upcoming release. Thank you!

[jamieclarke]

Updating Status to Fixed in 25.6.1

[Tom_edit]

still seems rather chunky on larger timelines; 25.6.2